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• W2159512992 abstract "Other| June 01, 1997 Na, K, Rb, and Cs exchange in heulandite single crystals; diffusion kinetics Ping Yang; Ping Yang Universitaet Bern, Laboratorium fuer Chemische und Mineralogische Kristallographie, Bern, Switzerland Search for other works by this author on: GSW Google Scholar Jano Stolz; Jano Stolz Search for other works by this author on: GSW Google Scholar Thomas Armbruster; Thomas Armbruster Search for other works by this author on: GSW Google Scholar Mickey E. Gunter Mickey E. Gunter Search for other works by this author on: GSW Google Scholar American Mineralogist (1997) 82 (5-6): 517–525. https://doi.org/10.2138/am-1997-5-611 Article history first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Ping Yang, Jano Stolz, Thomas Armbruster, Mickey E. Gunter; Na, K, Rb, and Cs exchange in heulandite single crystals; diffusion kinetics. American Mineralogist 1997;; 82 (5-6): 517–525. doi: https://doi.org/10.2138/am-1997-5-611 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietyAmerican Mineralogist Search Advanced Search Abstract Diffusion-exchange kinetics were determined at temperatures between 320 and 425 K for Na+ in single crystals of natural heulandite, Na0.96Ca3.54K0.09(Al8.62Si27.51O72) · nH2O, and K+, Rb+, and Cs+ for Na+ in Na-exchanged heulandite. Cation diffusion was measured on (010) cleavage plates with the aid of a polarizing microscope. This is possible because the optical properties, in particular the extinction angle, vary with the chemical composition of the channel occupants. This optical method is restricted to platy zeolites of monoclinic or triclinic symmetry where the channels are parallel to the crystal plate. Unlike conventional measurements, this method does not require the determination of the surface area of the zeolite.No indication of anisotropic diffusion was observed on (010) plates for any of the exchanged cation pairs. Diffusion coefficients (D) show that the diffusion rate of Na+ → Ca2+ is much slower than those of K+ → Na+, Rb+ → Na+, and Cs+ → Na+, because of the strong Coulombic interaction of Ca2+ with the tetrahedral framework compared with an exchange of monovalent species. The activation energy (Ea) and the pre-exponential factor (D0) were calculated from the variation of D with temperature for each diffusing cation. Comparable values of Ea for K+ → Na+ and Rb+ → Na+ suggest a similar diffusion process, while the lower value of Ea, combined with relatively low diffusion rates for Cs+ → Na+ implies a different diffusion mechanism for Cs+. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article." @default.
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• W2159512992 title "Na, K, Rb, and Cs exchange in heulandite single crystals; diffusion kinetics" @default.
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